Earnings (Loss) per Share (Earnings or Loss per Share) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Accounting Policies [Abstract]
Earnings (loss) from continuing operations	$ (1,323.3)	$ 634.5
Net earnings from continuing operations attributable to noncontrolling interests	(14.0)	(17.0)
Net earnings (loss) from continuing operations attributable to Liberty Global shareholders	$ (1,337.3)	$ 617.5
Weighted average common shares outstanding (basic EPS computation) (in shares)	348,407,676	377,747,016
Incremental shares (in shares)	0	7,362,615
Weighted average common shares outstanding (diluted EPS computation) (in shares)	348,407,676	385,109,631
Excluded potentially dilutive employee share-based incentive awards (in shares)	163,331,498	73,278,364